Remove redundant checks for asyncio.CancelledError

redis/asyncio/connection.py

@@ -502,8 +502,6 @@ async def read_from_socket(
  # data was read from the socket and added to the buffer.
  # return True to indicate that data was read.
  return True
- except asyncio.CancelledError:
- raise
  except (socket.timeout, asyncio.TimeoutError):
  if raise_on_timeout:
  raise TimeoutError("Timeout reading from socket") from None
@@ -722,7 +720,7 @@ async def connect(self):
  lambda: self._connect(), lambda error: self.disconnect()
  )
  except asyncio.CancelledError:
- raise
+ raise # in 3.7 and earlier, this is an Exception, not BaseException
  except (socket.timeout, asyncio.TimeoutError):
  raise TimeoutError("Timeout connecting to server")
  except OSError as e:

tests/test_asyncio/test_pubsub.py

@@ -917,7 +917,7 @@ async def loop_step_listen(self):
  except asyncio.TimeoutError:
  return False
 
- 
+
 @pytest.mark.onlynoncluster
 class TestBaseException:
  @pytest.mark.skipif(